Proteus (bulan)
Dinamakan sempena | Πρωτεύς Prōteys |
---|---|
Min jejari | 7005210000000000000♠210±7 km[5] |
Graviti permukaan khatulistiwa | 0.07 m/s2[lower-alpha 3] |
Kecondongan | 6997914552528045030♠0.524° (khatulistiwa Neptun) 6996453785605518526♠0.026°±0.007° (satah Laplace) |
Kelajuan purata orbit | 7003762300000000000♠7.623 km/s |
Albedo | 0.096[5][7] |
Ditemui oleh | Voyager 2 Stephen P. Synnott |
Apoapsis | 7008117709000000000♠117709±10 km |
Jisim | 7019440000000000000♠4.4×1019 kg (6994736720000000000♠7.3672×10−6 Earths)[lower-alpha 2] |
Dimensi | 424 × 390 × 396 km[2][lower-alpha 1] |
Isi padu | 7007340000000000000♠(3.4±0.4)×107 km3[2] |
Min ketumpatan | ≈ 1.3 g/cm3 (anggaran)[5] |
Sebutan | /ˈproʊtiːəs/[1] |
Paksi semimajor | 7008117647000000000♠117647±1 km (4.75 RN) |
Tempoh orbit | 7004969679961280000♠1.12231477±0.00000002 h |
Luas permukaan | 554,200 km2[6] |
Magnitud ketara | 19.7[5] |
Tarikh penemuan | 16 Jun 1989 |
Nama alternatif | S/1989 N 1 |
Kesipian | 6996530000000000000♠0.00053±0.00009 |
Kecondongan paksi | zero[2] |
Halaju lepas | 0.17 km/s[lower-alpha 4] |
Periapsis | 7008117584000000000♠117584±10 km |
Satelit bagi | Neptun |
Tempoh putaran | Segerak[2] |